Saw hanging



(No Model.) 2 Sheets-Sheet 1.

J. lHEYN SAW HANGING.

yNo. 570,094. Patented Oct. 27, 1896.

(No Model.) agneausheen 2.

J. HEYN.

SAW HANGING.

No. 570,094. Patented oct. 27, 1896.

UNITED STATES PATENT OFFICE..

JOHANNES HEYN, OF

STETTIN, GERMANY.

SAW-HANGING.

SIECIFICATION forming part of Letters Patent N o. 570,094, dated October 27, 1896.

Application tiled January l2, 1896. Serial No. 574,018. (No model.) Patented in Germany May 1,1894,No. 83,634 y in Austria November 30, 1895, No. lifi/4,560. and in Hungary January 6,1396,No.5,067.

.To all whom t may concern:

Be it known that I, J oHANNEs IIE YN, a subject of the King of Prussia, German Emperor, and a resident of Stettin, in the Kingdom of Prussia, German Empire, have invented an Improved Saw-Hanging, (for which Letters Patent have been obtained by me in Germany, N o. 83,634, dated May 1, 1894; in Hungary, No. 5,067, dated January 6, 1896, and in Austria, No. 4,560, Vol. 45, dated November 30, 1895,) of which the following is an exact specification.

This invention refers in general to saws, especially gang-saws or gang-saw mills, and in particular to the tangs of the blades of said saws. My improvements in said tangs relate to means for drawing the same in their longitudinal direction, lso as thereby to put the blades under tension. Said means consist, brieiy, in an eccentric attached to the tang of the blade and in abearing supporting said eccentric in at least two points or lines that are situated on opposite sides with regard to the Aline of connection of the said eccentric and said tang.

In order to make my invention more clear, I refer to the accompanying drawings, in which similar letters denote similar parts throughout the dierent views, and in which- Figure 1 is a side view of one form of construction of my invention. Fig. 2 shows the eccentrical disk e and its bearing-block separated from the other part, said block being slightly modified. Fig. 3 shows a key for op-` erating said disk. Figs. 4, 5, and 6 are three diagrammatical views concerning the reactive force of the strained blade with different points of application and with different shapes of the block f. Fig. 7 is a side view of another form of construction of my improved saw-blade tang. Fig. 8 is a separate view of the modified disk e of said other construction. Fig. 9 is a separate side view of the modified bearing-block f; and Fig. 10 is a separate front view of said block, together with a portion of the frame R.

The tang A, Fig. 1, is at its upper end furnished with the eccentric disk c, that is supported by .the bearing-block f. Apart from the eccentric position of the pivot z said disk is circular, and the bearing-surface of said block is shaped to correspond to the curvature of the said disk. The block f itself is supported by the frame R. The disk e is provided with a projection e2, upon which may be pnt the key S, Fig. 3.

If the eccentric disk c is in the position shown in Fig. 1, the pivot z is nearest to the bearing-block f, and the blade B is therefore either but very slightly strained or is not strained at all. When said blade is to be strained, the key S is put upon the projection c2 of the disk e, and the latter is then turned until the desired degree of tension of the blade B has been reached. By turning the said disk the pin ,2' is moved farther off the bearing-block f, and owing to the eccentric position of said pin the degree of tension of the blade will be the greatest when the disk c has been turned for one hundred and eighty degrees.

The bearing-block f lies loosely upon the frame R or may be displaced upon the same respectively. If, therefore, the disk e. is turned by moving the handle e2 to the right, the pin ,z will not only be raised but moved to the left too, and the tang A as well as the blade B will thus assume a correspondinglyinclined position with regard to the frame R. This may, however, be compensated by displacing the block f to the right for a suitable length of way. If the spaces between the tang and the two parts of the frame are but very small, the displacement of the block will occur perfectly automatically, and the tang as well as the blade will always remain in their proper position in spite of the eccen- 1 tricity of the disk e and in spite of the different positions of the eccentrically-arranged pin z. This is a distinct feature of my novel arrangement which distinguishes the latter from all previous ones.

In consequence of the bearing-block f being not flat, as f2 in the diagrammatical views, Figs. 4 and 5, but either curved, as f in Fig. 1, or angular, as f' in Fig. 2, the disk e will automatically keep its position whatever this latter may be, This will occur in any case in which there are at least two points or lines of support for the disk e situated on opposite sides with regard to the line of connection of said disk and the tang A or to the pin e', re-

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spectively, whereas with only one point or line of support the said disk can be fixed in not more than two positions.

Suppose e in the diagrammatical views, Figs. 4t and 5, be the eccentric disk, :1: the point of application of the force P, which is equal to the tension of the blade, and f2 a bearing-block that is shaped so as to support said disk on only one point p. Said point af, which, as a matter of course, in nothing else than the pin z', will automatically remain in its position only if it lies vertically above the point Vp, may be nearest to the latter, Fig. 4, or farthest away from the same, Fig. 5. If, however, the bearing-block is shaped so as represented in Fig. 6, there are two points of support p p2, and the point of application of the force P may, for instance, be displaced for an angle a l) c without being turned by said force. There may, therefore, every form of block be used in which the points or lines of support amount to at least two.

The eccentric disk e need not indispensably be perfectly circular, as in Figs. 1 and 2, but a segment s, Fig. 7, of it may be cut away, as in Figs. 7 and S. I prefer to employ this second form of construction if an easy removability of the bearing-block is desired. If said block is to be removed, the blade, tang, and disk need be but-slightly raised, when the said block may easily be drawn off in the direction of the arrow t, Fig. 7.

The bearing-blockf, Figs. l and 7, or f', Fig. i?, may be provided with guide-plates g, Figs.. 7, 9, and l0, for the disk e or e. I prefer to let said plates extend downward to the lower surface f3 of said block, so as to increase the surface of contact between the frame R and the said block.

IIaving thus fully described the nature of my invention, what I desire to secure by Iietters Patent of the United States is- 1. In a saw, the combination with the tang of the blade, of a rotatable disk attached eccentrically to said tang, and adapted to put said blade under tension; a bearing-block adapted to hold said disk, and shaped so as to support the latter in two lines situated on opposite sides with regard to the line of connection of the said disk and tang, said bearing-block being itself supported by suitable parts of the frame, and being` adapted to be displaced upon said partsin the plane of the said disk, and reetangularly to the direction of motion of the said tang, for the purpose as described.

2. In a saw, the combination with the tang of the blade, of a rotatable disk attached eccentrically to said tang, and having a segment cut off a bearing-block adapted to hold said disk, and shaped so as to support the latter at least in two lines situated on opposite sides with regard to the line of connection of the said disk and tang, said bearing-block being itself supported by suitable parts of the frame,and being adapted to be displaced upon said parts in the plane of the said disk, and rectangularly to the direction of motion of the said tang, forthe purpose as described.

In a saw, the combination with the tang of the blade, of a rotatable disk attached eccentrically to said tang, and adapted to put said blade under tension; a bearing-block adapted to support said disk in at least two lines situated on opposite sides with regard to the line of connection of the said tang and disk; guide-pieces for the latter fixed to said bearing-block, the latter being itself supported by a suitable part of the frame, and being adapted to be displaced upon said part in the plane of the said disk, and rectangu larly to the direction of motion of the said tang, for the purpose as described.

In testimony whereof I have signed this specification in the presence of two subscrib- 

